Direct Spring, Balanced by Flow Safe

Spring Operated Safety Relief Valves (ASME)

Flow Safe – F84L (Balanced): Liquid Service

Balanced style SRVs for liquid service. Balanced against the effects of backpressure without bellows. Made in accordance with ASME Section VIII or “CE” mark. Initial modulation at low flow with fixed blowdown. Available in carbon or stainless-steel materials as standard. Special alloy construction available upon request. Plastic seated with a variety of elastomer seal materials and connection styles available.

FEATURES

Spring-operated, modulating at low flow
Soft seated, fully balanced against backpressure without bellows
Pressure assisted drag seal for smooth operation
Full lift at 7.5% overpressure
Leak tight seating and re-seating
Fixed blowdown
Integral / full nozzle, 316/316L corrosion resistant trim
Packed lift lever available on most sizes

APPLICATIONS

Lube oil systems
Water systems
Chemical processing
Thermal relief
High-pressure temper quench systems
Installations with high outlet backpressures
Positive displacement pumps

Service Envelope

Connection Sizes Larger sizes available on request	½” x 1” - 2” x 3” (13mm x 25mm - 50mm x 75 mm)
Set Pressure Ranges See F84L Catalog for orifice specific ratings	30 – 24,277 psig (2.1 - 1674 barg)
Temperature Ranges	-65 to 525°F (-54 to 274°C)
Orifice Area Range	.015 – 1.689 in² (9.7 – 1089 mm²)
End Connections Custom types available on request	Threaded: NPT, SAE, MS33649/AS5202, AN 37° Flare Welded: ASME / DIN / API / SAE flanged, Grayloc Specialty: Swagelok® Tube / VCR, Threaded & Coned
Materials of Construction Custom available for service or on request	Carbon Steel, Stainless Steel, Monel, Hastelloy C / C22 / C276, Duplex 22% or 25% Cr
Seat/Seal Materials Custom available for service or on request	Seat Material (Plastic):Teflon®, Ekonol-filled PTFE, Kel-F (PCTFE), PI/PAI (Vespel®, Duratron®, or equal), PEEK Spindle Seal Material (Elastomer):Buna-N, Viton® (FKM) or equal, EPR/EPDM, FFKM (Chemraz®, Kalrez®, etc), Polyurethane, HNBR